- The private branch exchange is a smaller version of the CO switches used by telephone companies. It’s connected to the telephone handset using a line card and to the local exchange using a trunk card.

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- What are the 3 majors components of a PBX?

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- Terminal interface
- Switching network
- Control complex

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- The key system (not a switch unlike the PBX) is an alternative to the PBX, mostly used in office with 30 to 40 users, what are the 3 major components?

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- Key service unit.
- System software
- Telephones

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- What is the main difference between a key system and a hybrid telephone system?

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- The main difference is whether a single-line telephone can access a single CO local loop or trunk only (key telephone system),

or whether the single-line telephone can access a pool of CO local loop or trunk (hybrid telephone system.

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- What is call signaling?

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- It’s the capacity of a user to communicate a need for service to a network

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- What are the 3 types of call signaling? (Note; all 3 types must be carried across both analog and digital connections.)

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- Supervisory; a subscriber and telephone company notify each other of calls status with audible tones and exchange of electrical current.